/Engine/Plugins/Experimental/TextToSpeech/Source/TextToSpeech/Public/TextToSpeechEngineSubsystem.h
Subsystem for interacting with the text to speech system via blueprints. The subsystem consists of a number of text to speech channels associated with a text to speech channel Id. Each text to speech channel provides text to speech functionality such as vocalizing a string, stopping a vocalized string, controlling the audio settings of the channel and muting/unmuting a channel. Most of the functions take a text to speech channel Id which allows you to request text to speech functionality on the requested channel. All newly added text to speech channels start off deactivated and must be activated before any text to speech functionality can be used.
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)() class UTextToSpeechEngineSubsystem : public [UEngineSubsystem](API\Runtime\Engine\Subsystems\UEngineSubsystem)